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@B-Boy Currently anything CD-based are not possible, hence why no sega cd and stuff like that. GBA's gotta wait until 10 years after its last commercially released game to come out, if i recall correctly

Yeah I knew that it wasn't an easy task to upload stuff like that, I was kinda brainstorming on stuff earlier than the likes of the PS3, which I assume would be easier to Manage.

That's odd, I wonder why an ISO would be harder to load than any other ROM image? I guess I could see problems on multi-disk games that require swapping without being able to save and reboot (Chrono Cross, Monster Rancher, etc.).

possible reasons
lack of demand
lack of technological feasibility within the arcadeox platform, though I'm not sure about that

chances are that the demand isn't enough to justify the server space being used and the amount of work that would go into getting it up and running and testing all of the games, since c64 has a very large library as you pointed out